/*
 * Copyright (c) 2012 Robert Burrell Donkin robertburrelldonkin.name
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
 * and associated documentation files (the "Software"), to deal in the Software without restriction, 
 * including without limitation the rights to use, copy, modify, merge, publish, distribute, 
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software 
 * is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or 
 * substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 */
package name.robertburrelldonkin.alfie;

import java.util.concurrent.BlockingQueue;

public abstract class QueuingSource<Result> implements Source {

	private final BlockingQueue<Message<Result>> out;

	public QueuingSource(BlockingQueue<Message<Result>> out) {
		this.out = out;
	}
	
	protected final void fatal(Throwable cause) {
		try {
			out.put(new Message<Result>(cause));
			close();
		} catch (InterruptedException e) {
			e.printStackTrace();
			fatal(cause);
		}		
	}

	protected final void output(final Result result) {
		try {
			out.put(new Message<Result>(result));
		} catch (InterruptedException e) {
			e.printStackTrace();
			output(result);
		}
	}

	public final void close() {
		hookForClose();
		try {
			out.put(new Message<Result>());
		} catch (InterruptedException e) {
			e.printStackTrace();
			close();
		}
	}

	protected void hookForClose() {}
}